Information processing device, information processing system, and non-transitory computer readable medium

An information processing device comprising:

• at least one processor configured to implement:
• an email receiving unit that receives an email with an attached image and an information identifier, the information identifier is generated by a sender of the email and is at least one of a value of a hash function applied to the information transmitted in the email, a hash function applied to information attached to the email, or a serial number indicating a transmission order of a plurality of emails to be transmitted;
• an extraction unit that extracts the information identifier and a transmitter identifier from information indicating that the email has been received;
• a transmission unit that transmits transmission-check-request information including the information identifier to the sender of the email indicated by the transmitter identifier;
• and
• a presentation controller that causes a warning to be presented if, from the email sending device, the information processing device receives transmission-check-response information indicating that transmission has not occurred or does not receive, within a predetermined period, transmission-check-response information indicating that transmission has occurred.

An information processing system comprising:

• a first information processing device that transmits information;
• and
• a second information processing device that receives the information,
• wherein the first information processing device includes at least one processor configured to implement:
• an email transmission unit that generates an information identifier that is at least one of a value of a hash function applied to the information transmitted in the email, a hash function applied to information attached to the email, or a serial number indicating a transmission order of the email based on a plurality of emails to be transmitted, and transmits, to the second information processing device, an email with an attached image and the information identifier,
• a memory that stores a transmission history including the information identifier of information indicating that the email has been transmitted to the second information processing device, and
• a transmission unit that receives a transmission-check request including transmission-check-request information including the information identifier from the second information processing device, and transmits, to the second information processing device, transmission-check-response information indicating that transmission has occurred if the transmission history includes the information identifier included in transmission-check-request information received from the second information processing device, and
• wherein the second information processing device includes at least one processor configured to implement:
• an email receiving unit that receives an email with an attached image from the first information processing device,
• an extraction unit that extracts the information identifier and a transmitter identifier from information indicating that the email has been received,
• a transmission unit that transmits, to the first information processing device indicated by the transmitter identifier, and the transmission-check-request information including the information identifier, and receives from the first information processing device the transmission-check-response information
• a presentation controller that causes a warning to be presented if, from the first information processing device, the second information processing device receives the transmission-check-response information indicating that transmission has not occurred or does not receive, within a predetermined period, the transmission-check-response information indicating that transmission has occurred.

A non-transitory computer readable medium storing a program causing a computer to execute a process comprising:

• generating an information identifier based on an email to be transmitted, the information identifier being at least one of a value of a hash function applied to the information transmitted in the email, a hash function applied to information attached to the email, or a serial number indicating a transmission order of the email based on a plurality of emails to be transmitted;
• transmitting the email with an attached image and the information identifier to an external device;
• storing a transmission history including the information identifier of information indicating that the email has been transmitted to the external device;
• receiving a transmission-check request including transmission-check-request information including the information identifier from the external device;
• and
• transmitting, to an external device, transmission-check-response information indicating that transmission has occurred if the transmission history includes the information identifier included in transmission-check-request information received from the external device.

A non-transitory computer readable medium storing a program causing a computer to execute a process comprising:

• receiving an email with an attached image and an information identifier, the information identifier is generated by a sender of the email and is at least one of a value of a hash function applied to the information transmitted in the email, a hash function applied to information attached to the email, or a serial number indicating a transmission order of the email based on a plurality of emails to be transmitted;
• extracting the information identifier and a transmitter identifier from information indicating that the email has been received;
• transmitting transmission-check-request information including the information identifier to a sending device indicated by the transmitter identifier;
• and
• causing a warning to be presented if transmission-check-response information indicating that transmission has not occurred is received from the sending device or if, within a predetermined period, transmission-check-response information indicating that transmission has occurred is not received from the sender of the email.

A non-transitory computer readable medium storing a program causing a computer of a system to execute a process, the system including a first information processing device that transmits information and a second information processing device that receives the information, the process comprising:

• generating an information identifier based on an email to be transmitted, the information identifier is at least one of a value of a hash function applied to the information transmitted in the email, a hash function applied to information attached to the email, or a serial number indicating a transmission order of the email based on a plurality of emails to be transmitted;
• transmitting, from the first information processing device to the second information processing device, the email with an attached image and the information identifier;
• storing, in the first information processing device, a transmission history including the information identifier of information indicating that the email has been transmitted to the second information processing device;
• receiving, from the first information processing device to the second information processing device, an email with an attached image;
• extracting, in the second information processing device, the information identifier and a transmitter identifier from information indicating that the email has been received;
• transmitting, from the second information processing device to the first information processing device, a transmission-check request including transmission-check-request information including the information identifier from the first information processing device;
• transmitting, in response to receiving the transmission-check request, from the first information processing device to the second information processing device, transmission-check-response information indicating that transmission has occurred if the transmission history includes the information identifier included in transmission-check-request information received from the second information processing device;
• and
• causing, in the second information processing device, a warning to be presented if transmission-check-response information indicating that transmission has not occurred is received from the first information processing device or if, within a predetermined period, transmission-check-response information indicating that transmission has occurred is not received from the first information processing device.